cpb-us-e1.wpmucdn.com · 2016-02-03 · sippi in the late eighteenth century, were aggres- sively...
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cpb-us-e1.wpmucdn.com · 2016-02-03 · sippi in the late eighteenth century, were aggres- sively expanding at the expense of the Crows, Kiowas, and Pawnees when whites began arriving